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Add foundation for TypeVar defaults (PEP 696) #14872

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merged 3 commits into from
May 29, 2023
Merged

Add foundation for TypeVar defaults (PEP 696) #14872

merged 3 commits into from
May 29, 2023

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cdce8p
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@cdce8p cdce8p commented Mar 11, 2023 •
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Start implementing PEP 696 TypeVar defaults. This PR

  • Adds a default parameter to TypeVarLikeExpr and TypeVarLikeType.
  • Updates most visitors to account for the new default parameter.
  • Update existing calls to add value for default => AnyType(TypeOfAny.from_omitted_generics).

A followup PR will update the semantic analyzer and add basic tests for TypeVar, ParamSpec, and TypeVarTuple calls with a default argument. -> #14873

Ref #14851

@cdce8p cdce8p mentioned this pull request Mar 11, 2023
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@hauntsaninja hauntsaninja requested a review from JukkaL May 2, 2023 18:22
JelleZijlstra
JelleZijlstra reviewed May 5, 2023
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mypy/semanal.py Outdated
# Similar to regular (user defined) type variables.
self.process_placeholder(
None,
"Self upper bound",
"Self upper bound or default",
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Maybe better to have a separate message for the two cases?

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In this particular instance I believe it isn't even necessary to check it at all. For Self the default is always set to AnyType(TypeOfAny.from_omitted_generics) and thus can't include a placeholder. I've split the calls in process_typevar_declaration though.

Also noticed that I was missing these checks in process_paramspec_declaration and process_typevartuple_declaration which I added now.

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@cdce8p cdce8p mentioned this pull request May 10, 2023
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JelleZijlstra
JelleZijlstra approved these changes May 29, 2023
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Looks good, one suggestion

mypy/nodes.py Show resolved Hide resolved
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

@JelleZijlstra JelleZijlstra merged commit a568f3a into python:master May 29, 2023
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@Dreamsorcerer Dreamsorcerer mentioned this pull request May 29, 2023
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cdce8p commented May 29, 2023

Thanks @JelleZijlstra! I'll take a closer look at my followup PR tomorrow.
Would you mind creating a new label, something like topic-pep-696? That would help keep track of PRs and upcoming issues.

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Done: topic-pep-696 TypeVar defaults . I also just fixed the merge on #14873 (possibly incorrectly, there's some self-check failures) and added some comments.

@JelleZijlstra JelleZijlstra added the topic-pep-696 TypeVar defaults label May 29, 2023
@cdce8p cdce8p deleted the TypeVar-01-foundation branch May 29, 2023 23:55
@cdce8p cdce8p mentioned this pull request May 30, 2023
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@VincentVanlaer VincentVanlaer mentioned this pull request Jun 15, 2023
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@JelleZijlstra JelleZijlstra JelleZijlstra approved these changes

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